| 摘要 |
PROBLEM TO BE SOLVED: To provide a water storage tank which enables a large quantity of water to be stored even in an installation area, and which can be installed even in a downtown district, a mountainous region, and a company premise. SOLUTION: Characteristically, the water storage tanks are stacked in a multistage shape like a pyramid, and rainwater retentive efficiency and the volume of reservoir water are increased. COPYRIGHT: (C)2007,JPO&INPIT
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